Fire-box arch



Aug. 30, 1927. 1,"641,o43

` ID.Y E. MOORE FIRE Box ARCH Filed oct. 9, 192s y; Z.l

yCII

Patented Aug. 30, 1927.

"UNITED STATES PATENTQFFICE- OLIVER A'. HARKER, JR., or ru'ariiiia, `rENNEssEE.`

FIRE-Box Anon.

Application filed October 9,1926. Serial No.`14Q,491. f

. Thisinvention relates to the arches used in the "fire .boxes of locomotive and stationary engines. These arches, as usuallyconstructed, are of solid brick extending upward and forward from the tube sheet and acting to deflect the fire and `the gases'and products of combustion upward and forward yand then through the fire tubes. These arches also .are often constructed of hollow brick, Vconstituting air tubes or lues which open upon the exterior of the fire box and conduct air to the fire. This lowers the temperature of the lire box by -admitting cold air thereto and also requires that vholes be drilled in the lire box for the passage of air. Furthermore, withk this construction, when the arch begins to burn out from long wea-r, this cold air coming iii through these openings cools down the fire box and in many cases causes the engine to fail in making steam. vIt is often the case also that the arch falls down into the iii-e box soon after it is installed, due to many dilfereing causes and this lets the cool air-in.

y rhe general object of the present iiiven= tion is to provide an arch formed of hollow bricks set end to end soas to constitute flues, these flues opening at theA rear end of the fire box so as to receive iiames and hot gases therefrom. These flames and hot gases pass out at tlie'top or back end of the arch, causing a blast of flame which burns the gases that are passing over the back end of the arch, thus eliminating smoke as well as saving fuel. Furthermore, all the fine coal that falls `ontop of the arch is y burned for the reason that the arch is much hotter on top than the solid arch now in Vuse in all locomotives or the arch having cool air iiues. v

My invention is illustrated in the accompanying drawings wherein :ef

Figure y1 is a vertical sectional view through a locomotive nre box showing my improved arch construction; a

Fig. 2 is a transverse sectional view through the arch;

Fig. 3 is a fragmentary the arch. y

Referring to these drawings it will be seen that 1 have illustrated diagraminatically the fire boX 10 of a locomotive engine, though my invention is not limited to use with locomotive engines. The fire box at top plan view of its rear y.end is rdeiined. by the tube sheet 11 and the bottom .of the-tire box is formed gby the grate 12.V Tubes 13 extend .from 4the tube sheet. A water space 14; forms'the rear wall of the fire box. My improved arch extends transversely across the fire `box in 'the usual inainier and is composed of a plurality of fire brick designated 15, veach of these fire brick being formed with ,a longitudinally extending passage 16. There aire as manyrows of fire .brick asis necessary to extendftransversely across the fireV box andthe `fire brick may vbe inade either relatively narrow or relatively wide, Aas may be desired.4 The innermost fire -brick 17 of each row has its end 18 out oflx so as to fit snugly against the tube sheet 11 and has its underface cut away at the rear end of the lire brick as at 19, so as to provide an inlet opening for the flames and gases arising from thev coal bed; These llames vand hot gases of combustion pass upward through the tlues 16 `and out through the upper ends of these flues and then `pass for` ward through .the ire tubes 13.

W'hile I do not wish to be limited to any particular means for supporting the fire brick 15, l have illustrated the fire brick as being supported by two. 6% siplion tubes 20 and two 3 circulation tubes 21 which extend from the water space of the boiler to the water space 14.- Each brick under these circumstances is cut away vat its lower corners, as at 22, to lit over these tubes 2O and 21, and thus the bricks cannot shift out of place.

As before remarked, Ido not wish to be limited to the use of relatively small brick in locomotive boilers but relatively larger arch brick may be used on stationary boilers. These bricks will be longer than the bricks illustrated in the drawing and need not be supported by means of siphon tubes or the vcirculating tubes but the arch will extend My eonetruetion does `not require :my changes to be made in order to instell it in the 4lire box. No mutter what happens to the arch 11o Cold nir cen be let in und with my construction should the arch be de tective in any manner, the fuel would burn :in the sume nummer es it no arch was uscch Whereas with arches having Cold air ducts persing through them :my detect in the arch causes the cold nir to be discharged into the lire und reduces the teinpeuture to eurh :in extent that. the engine Will not inuflie elemn. All the line coal which is liable to `lull upon the top oit' the arch will burn with my construction due to the arch beingparti@uhu-livY hot. This; prevents:4 the nnluu'ned Coul troni stopping` up the bottoni rouel ol1 llues ranging; leakage and engine itfrilurcr. .Fui-tlwrniore, this arch collects no honey roiubi lieruire the uic-eh, is too hot 'for the honey combi to utichr to it. The arch further :iets ufr@ u niiuinr;l und combustion chamber und by tunning; more of the grises causes u higher tire box temperai ture which in turn cuusiesi :i higher degree ot Superheut. Furthermore this` :ireh secures un eren temperature all. over the bricks by haring' heet inside :is well as out.

il @liliumln u, iurnuee llire box` un upwardly und lm'u'urdly extending arch formed olie plurulity ot loneiturlinulli7 extending courses olf brick, the bricks of euch course being hoh iou' und columnnieuting)i with each other to thereby :torni fines straight from end to end und (lisehurging at their upper ends at the @reet ot the arch, Suid :nich terminating lQhort olE the rear Wall of the lire box, the lower end ol eueh [lue opening; upon the u'n 'le1 :l"uce oit.' the arch ut the 'lorwmfrl end thereof. the bricks oli euch ourse being cut :muy ut their lower rornerS? und tubes extending' upuuirdly und. longitudin{ill}7 through the lire box und cilguging the cut. :muy corners ot the brielral to Support the :i1-rh, Huid tubes eomimlniceting with the writer space ot the boiler.

In teetinuouj.y whereoil I hereunto ullix my signature.

DORSEY EUGENE MOORE. 

